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    <title>Document</title>
    <script type="text/javascript">
        window.onload=function()
        {
            //向对象中添加方法 up down
            let game =
            {
                name:'俄罗斯方块',
                up: function(){},
                down: function(){}
            };
            //声明一个对象
            let methods=
            {
                up:Symbol(),
                down:Symbol()
            };
            game[methods.up]=function()
            {
                console.log("我可以改变方向");
            };
            game[methods.down]=function()
            {
                console.log("我可以快速下降");
            };
            console.log(game);
            game[methods.up]();

            let game2=
            {
                name:"狼人杀",
                [Symbol("say")]:function()
                {
                    console.log("我可以发言");
                },
                [Symbol("zibao")]:function()
                {
                    console.log("我可以自爆");
                }
            };
        };
    </script>
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